TRS Frequency Shifting in SBFD Slots to Avoid Uplink Overlap
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Solution Overview
Problem
In wireless communications systems, the overlap of tracking reference signals (TRS) with uplink subbands or guard bands in subband full duplex (SBFD) slots or symbols leads to reception issues for user equipment (UE), as they cannot receive TRSs scheduled in these bands.
Innovation Solution
The UE and/or network entity can drop, puncture, or shift the frequency position of TRSs to manage overlaps with uplink subbands or guard bands, ensuring TRS reception occurs within downlink subbands, using frequency hopping schemes for half duplex and SBFD slots/symbols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TRS is scheduled in SBFD slot/symbol, then TRS reception is enabled, but overlap with uplink subband or guard band causes reception failure
Solution Approach 1:
The patent segments the frequency spectrum into distinct subbands (downlink subband, uplink subband, and guard band) within SBFD slots. By dividing the TRS reception resources into specific subband allocations, the system ensures that TRS signals are scheduled only in downlink subbands, preventing overlap with uplink subbands or guard bands. This segmentation resolves the contradiction by spatially separating conflicting signal types in the frequency domain.
2Ease of operation
If frequency resources are allocated for TRS, then TRS monitoring is enabled, but overlap with uplink resources causes monitoring failure
Solution Approach 1:
The patent applies local quality by configuring TRS monitoring specifically in downlink subbands while excluding uplink subbands and guard bands. The network entity provides configuration information that specifies which frequency resources within the downlink subband are allocated for TRS monitoring. This localized allocation ensures that monitoring operations occur only in regions where downlink signals are transmitted, preventing interference from uplink transmissions.
3Reliability
If TRS is transmitted in downlink subband, then TRS reception is possible, but frequency position may still overlap with uplink subband
Solution Approach 1:
The patent implements dynamic frequency position management through frequency hopping schemes. The network entity configures frequency hopping parameters that dynamically adjust the frequency position of TRS across different slots or symbols. This dynamic approach allows the system to adaptively select frequency positions within the downlink subband, avoiding static allocations that might consistently overlap with uplink resources, thereby maintaining reliable TRS reception while managing frequency position complexity.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Techniques described herein relate to schemes for managing an overlap of at least part of a tracking reference signal (TRS) with an uplink subband or a guard band in a subband full duplex (SBFD) slot or symbol. In some examples, if a user equipment (UE) and/or a network entity determines that at least a portion of a TRS is scheduled for reception in an uplink subband or a guard band of an SBFD slot or symbol, the UE and/or the network entity may: drop the TRS, puncture the portion of the TRS that overlaps with the uplink subband or the guard band; or may shift the frequency position of the TRS such that the TRS is scheduled within the downlink subband(s) of the SBFD slot or symbol.